RF alert system for detecting contact closure

[speedway_navigator]

Our waste water lift stations only activate a flashing light or horn when they go into alarm mode and our state environmental dept wants our
plant operator to have a more direct notice.

Back in my COSC days I installed a system in a building that sent out voice announcements on a radio (HT-90?) that said something like 'alert zone 1' whenever an exterior door was opened.

Anyone using something like that now? I suppose an alternate would be internet based but we'd have monthly ISP bills forever.

 

[N5XPM]

I installed a Zetron Model 18 System years ago for a water utility to monitor floats in a water storage tank with a model 1801 status panel. Very rugged system greatly increasing reliability and saving cost over leased line system. Used Motorola CDMs for the RF path.

 

[Thunderknight]

Take a look at these...might do what you need:

Sensor Monitoring Voice Alerting Wireless Transmitters | Ritron QuickTalk™ RQT | 2 Way Radios

Monitor virtually any process or condition 24/7/365 over your 2-way radio system. Wireless alerting empowers your staff to respond to emergencies more quickly, to prevent costly damage or reduce disruptive downtime. Monitor temperature, liquid level, power-fail, moisture, vandal/tamper alarm...

www.ritron.com

 

[AA1PL]

The Zetron model 1516 Sentri-Voice does exactly what you're looking for. I've installed several of them in the past. Zetron was recently aquired by Codan Communications (formerly Daniels) and I hope they don't discontinue their specialty products like the Sentri Voice. They are around $1200-$1500 list price depending on options and voice memory needed. The Model 18's that N5XPM mentioned in his reply is also a good product also but it doesnt send a voice meassage. The Model 18's basically give you a output signal at the receive location whenever an input goes active at the sending location. There are 8 inputs and 8 outputs at each end to use for various signals. The FSK data communication between the Model 18 boxes can be done over regular analog radios. You have to purchase Zetron products through a Zetron authorized dealer. Here's a link where you can get more info Specialty Products | Zetron | Communications Systems

 

[Firebuff880]

@speedway_navigator

We have stated using a small lightweight LTE digital asset tracker for some customers that also has support for a number of IO Points. Yes, you have a small Capex fee and then the Cellular fee ongoing, but the digital IoT fees are not like having an iPhone on the network.

PM me if you want to talk about what it might be able do for you..

 

[RFI-EMI-GUY]

Make sure your state does not have a requirement for the circuit to be supervised for fault detection. What you installed at your COSC was a SCADA system like INTRAC or one of Motorola's later spin off products. Those get polled and return a response.

 

[Project25_MASTR]

Our waste water lift stations only activate a flashing light or horn when they go into alarm mode and our state environmental dept wants our
plant operator to have a more direct notice.

Back in my COSC days I installed a system in a building that sent out voice announcements on a radio (HT-90?) that said something like 'alert zone 1' whenever an exterior door was opened.

Anyone using something like that now? I suppose an alternate would be internet based but we'd have monthly ISP bills forever.

Done a bit of this in the past for various things. Easy way is use radios that support two tone encode and use the contact closure to close PTT with a receiver that can use multiple two tone decode profiles to alias the call.

I can also think of something similar using a DMR Tier II solution.

 

[speedway_navigator]

Take a look at these...might do what you need:

Sensor Monitoring Voice Alerting Wireless Transmitters | Ritron QuickTalk™ RQT | 2 Way Radios

Monitor virtually any process or condition 24/7/365 over your 2-way radio system. Wireless alerting empowers your staff to respond to emergencies more quickly, to prevent costly damage or reduce disruptive downtime. Monitor temperature, liquid level, power-fail, moisture, vandal/tamper alarm...

www.ritron.com

Thanks, I was looking at that since I ran into one at a Goodwill store. They were on 467.875, had 'assistance needed at the fitting rooms' going when someone hit the button. They are a few blocks from a restaurant using the same freq so I volunteered to see if I could mitigate the restaurant's claim about them 'being on MY channel.'
Both users are members of the
'we don't need no stinkin license' fan club.